/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/Stack/NiagaraStackInputCategory.h
[TWeakPtr](API\Runtime\Core\Templates\TWeakPtr)< [FNiagaraHierarchyCategoryViewModel](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarch-) > GetHierarchyCategory() const